Corrosion resistant tubular article



; Patented Oct. 18,1938

CORROSION RESISTANT room ARTICLE Donald K. Crampton, Marion, and Newell W. Mitchell, Waterbury, Conn., assignors to Chase Brass a Copper (30., Incorporated, Waterbury, Conn., a corporation of Connecticut j No Drawing.

Application March 30, 1936,

Seria1N0.71,806 6 Claims. (01. 138-47) This invention relates to improvements in corrosion-resistant tubular articles, and more particularly, corrosion-resistant wrought-metal tubular articles formed of copper-base alloys con- 5 taining phosphorus, aluminum and tin, with or without the addition of one or more other elements which do not seriously impair the prop saline liquid or dilute acid. The additional elemerits may range up to a total of about 10%, depending on what elements are added, some being more innocuous than others. While each of the elements iron, antimony and arsenic should not be present much in excess of about 0.1%, silver, which is comparatively innocuous, may be present to as high as about 10% provided not too much of other elements is present. Nickel may be present to as high as about 5%, and lead and silicon may each be present to ashigh as about o o In order that our improved alloys may be wrought to make tubular articles such, for ex- 35 ample, as tubes, pipes, etc., for conveying or holding or otherwise contacting corrosive liquids, the total of the phosphorus, aluminum and tin preferably should not be greater than about 7 with the phosphorus from about to about 2%, the aluminum from about to about 4%, and the tin from about to about 3 Stillbetter workability of the metal is had when the total of the phosphorus, aluminum and tin does not exceed about 5 /2%, with the 45 phosphorus from about to about 1' /2%.' the aluminum from about A% to about'3%, andthe tin from about to about 2%.

An advantageous alloy range consists in having the phosphorus from about. /2% to about 55 phorus, about 7 aluminum and about 3% tin, 1

the second having about 1% phosphorus, about 1% aluminum and about 2% tin, and the third having about 1% phosphorus, about 1 alu minum and about 1 tin. v

The invention maybe carried out in other specific ways than those herein set forth without departing from the spirit and essential char- 1 1. acteristics of the invention, and the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, and all'changes coming within the meaning and equivalency rangeof the appended claims are,-

intended to be embraced therein.

We claim: a V

1. A wrought-metal tubulararticle for use in contact with ,saline liquid or dilute acid and characterized by good corrosion resistance to saline liquid anddilute acid, and formed from an alloy containing: phosphorus as an essential element iromjabout toabout 2%; aluminum 2 from about 4% toabout 4%; tin from about U to about 3%; and the balance substantially I of copper. v v

2. A wrought-metal tubular article for use in contact with saline liquid or dilute acid and characterized by good corrosion resistance to saline liquid and dilute acid and formed from an alloy containing: phosphorus as an essential element from about A% to about 2%; aluminum from about 4% to about 4%; tin from about 2% to about 3%%; the sum of the phosphorus, aluminum andtin being not greater than-7.5%; and the balance substantially of copper.v

3. A wrought-metal tubular article for usein' contact with saline liquid or dilute acid and characterized by good corrosion resistance to saline liquid and-dilute acid and formed from an alloy containing: phosphorus as an essential element from about to about 1 aluminum from about to about 3%; tin from 40 about 1% to about 3%; and the balance subv stantially of copper.

4. A wrought-metal tubular article for 'use in contact with saline liquid on dilute acid and characterized by good corrosion resistance to saline liquid and dilute acid and formed from an alloy containing: phosphorusas an essential element about aluminum, about /4,%; tin about"3%; and the balance substantially of coppen I p 5. A wrought-metal tubular article for. use in contact with saline liquid or dilute acid and characterized by good corrosion resistance to saline liquid and dilute acid and formed from an alloy 7 containing: phosphorus as an essential element o about 1%;- aluminum about 1%; tin about 2%; alloy containing: phosphorusas an essentialeleand the balance substantially of copper. ment about 1%; aluminum about 1 5%; tin 6. A wrought-metal tubular article for use in about 1 and the balance substantially of contact with saline liquid or dilute acid and copper.

characterized by good corrosion resistance to DONALD K. CRAMPTON. 5 saline liquid and dilute acid and formed from an 7 NEWELL W. MITCHELL. 

